Paint Calculator
Estimate paint needed for a room. Enter room dimensions, doors, and windows to calculate gallons for 1 or 2 coats.
Paint Calculator
Estimate how much paint you need for a room by entering its dimensions and the number of doors and windows. Results include single and double coat estimates.
Calculation Details
- Wall area = perimeter × ceiling height (excluding ceiling and floor)
- Standard door area subtracted: 20 sq ft per door
- Standard window area subtracted: 15 sq ft per window
- Coverage rate: approximately 400 sq ft per gallon
Frequently Asked Questions
How much paint do I really need?
Most rooms need 2 coats of paint. This calculator shows estimates for both 1 and 2 coats.
Should I subtract ceiling area?
This calculator only computes wall area. If you also want to paint the ceiling, add the floor area (L × W) to your paintable area.